All the involuntary actions, including blood pressure, salivation and vomiting are controlled by the:

Correct option is B

The correct answer is (B) medulla.

Explanation:
The medulla oblongata in the brainstem controls involuntary actions such as blood pressure, salivation, vomiting, and vital functions like heartbeat and breathing.

Other options explanations:

• Limbic system: Handles emotions, behavior, and memory, not involuntary actions.
• Midbrain: Manages motor movements and reflexes, not autonomic functions.
• Forebrain: Responsible for cognition and voluntary actions, not basic involuntary processes.

Information booster:

• The medulla oblongata is part of the hindbrain, connecting the brain to the spinal cord.
• It regulates the autonomic nervous system and controls essential reflex actions like coughing and sneezing.